I just gave a try to the BufferedFileStream.
As usual, code is MIT.
Implementation is rough, readOnly, partial (no support for basicNext
crap & al), untested (certainly has bugs).
Early timing experiments have shown a 5x to 7x speed up on [stream
nextLine] and [stream next] micro benchmarks
See class comment of attachment

Reminder: This bench is versus StandardFileStream.
StandardFileStream is the "fast" version, CrLf anf MultiByte are far worse!
This still let some more room...

Integrating and testing a read/write version is a lot harder than this
experiment, but we should really do it.

Nicolas
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